
There is decidedly something a bit Monarty about that.
I've had a small glass in pink and purple, with applied and acid treated foot, but I'm not sure if the foot was the same shape and the glass was only about 2.5" tall.
However, when these little glasses were made, they were to go with decanter sets, and not always catalogued.
This is all off the top of my head, and my Ysart knowledge is only of second-hand quality.